Device for the treatment of water, in particular a filter device, and cartridge

1. A filter device for water treatment, comprising:

a cartridge, which has a container to receive treatment agents for water; and a male connection head arranged on the container, and

a connection element, which comprises a female receptacle for inserting the male connection head in the connection element, wherein at least one locking shaft is integrally provided on the connection element, with which the male connection head can be secured in the female receptacle of the connection element, wherein the locking shaft is rotatably journaled and can be turned from a locking position into an unlocked position and vice versa,

wherein the connection element has an inlet channel and an outlet channel, and the locking shaft is arranged in the a) inlet channel or b) outlet channel or c) both the inlet channel and outlet channel, and the locking shaft has a valve segment in a) the inlet channel or in b) the outlet channel or in c) both the inlet channel and outlet channel.

2. The device per claim 1 , wherein the locking shaft is arranged in the connection element, and the male connection head has at least one recess, with which the locking shaft engages in its locking position.

3. The device per claim 1 , wherein the locking shaft extends perpendicular or parallel to a lengthwise axis of the cartridge.

4. The device per claim 1 , wherein the locking shaft has a locking segment.

5. The device per claim 4 , wherein the locking segment is an eccentric segment.

6. The device per claim 4 , wherein the locking segment has a recess.

7. The device per claim 1 , wherein the valve segment has a connection channel.

8. The device per claim 7 , wherein the connection channel is a partial annular groove in an outer circumferential surface of the locking shaft.

9. The device per claim 8 , wherein the partial annular groove is surrounded by at least one sealing element.

10. The device per claim 1 , wherein the locking shaft has two valve segments, between which a locking segment is arranged.

11. The device per claim 10 , wherein the locking shaft has a bypass mechanism for the two valve segments.

12. The device per claim 11 , wherein the bypass mechanism has a bypass channel joining the two valve segments.

13. The device per claim 12 , wherein the bypass channel extends inside the locking shaft and emerges into the two valve segments.

14. The device per claim 1 , wherein the valve segment has at least one sealing element on either side.

15. The device per claim 2 , wherein the recess in the male connection head has at least one recess surface.

16. The device per claim 2 , wherein the recess is profiled.

17. The device per claim 15 , wherein the recess has at least two recess surfaces which are displaced in height in the lengthwise direction of the recess.

18. The device per claim 4 , wherein the locking segment of the locking shaft has at least one locking surface, engaging with a recess surface.

19. The device per claim 1 , wherein the connection element has a catch, which engages with the locking shaft in the locking position and secures the locking shaft.

20. A cartridge for the device according to claim 1 , comprising: the container to receive treatment agents for water, including filter means, and the male connection head arranged on the container for joining to the connection element, wherein the male connection head has at least one recess for engaging with the locking shaft arranged on the connection element.

21. The cartridge per claim 20 , wherein the recess in the male connection head has at least two recess surfaces.

22. The cartridge per claim 20 , wherein the recess is profiled.

23. The cartridge per claim 22 , wherein the recess has at least two recess surfaces which are displaced in height in a lengthwise direction of the recess.